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keliling = 4 x 10 cm
keliling = 40 cm
b) luas
10 = √(d1/2)² + (d2/2)²
10 = √(12/2)² + (d2/2) ²
maka
d2/2 = √(10²-6²)
d2/2 = √100-36
d2/2 = √64
d2/2 = 8
maka d2 = 8 x 2 = 16 cm
luas = d1 x d2 x 1/2
luas = 12 x 16 x 1/2
luas = 12 x 8
luas = 96cm²
b. luas = 96cm²
panjang salah satu diagonal dibagi 2 = 6 => phytagoras
√100-36=√64=8 cm x 2 = 16 cm
luas = d1xd2 :2 = 12x16:2=96 cm²